I'm sick and haven't been out of home for a few days. So I'll serve you an older photo of Charles bridge. This is from a kind of back street which leads to a very small park with a lot of benches facing the river and Petrin hill. As you can see, there's a tower on that hill. It's called Petrin tower (guess you would guess its name yourself :). It was build in 1891 as a smaller version of Eiffel tower in Paris.